objtool: Rework instruction -> symbol mapping

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Currently insn->func contains a instruction -> symbol link for
STT_FUNC symbols. A NULL value is assumed to mean STT_NOTYPE.
However, there are also instructions not covered by any symbol at all.
This can happen due to __weak symbols for example.

Since the current scheme cannot differentiate between no symbol and
STT_NOTYPE symbol, change things around. Make insn->sym point to any
symbol type such that !insn->sym means no symbol and add a helper
insn_func() that check the sym->type to retain the old functionality.

This then prepares the way to add code that depends on the distinction
between STT_NOTYPE and no symbol at all.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>

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This commit is contained in:

Peter Zijlstra 2022-09-22 22:03:50 +02:00

parent 08ef8c4011

commit dbcdbdfdf1

2 changed files with 66 additions and 51 deletions

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105

tools/objtool/check.c

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12

tools/objtool/include/objtool/check.h

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